Function nginx::RSA_meth_get_sign

pub unsafe extern "C" fn RSA_meth_get_sign(
    meth: *const RSA_METHOD
) -> Option<unsafe extern "C" fn(meth: c_int, arg1: *const c_uchar, arg2: c_uint, arg3: *mut c_uchar, arg4: *mut c_uint, arg5: *const RSA) -> c_int>